You're getting great advice here, I'll just add my voice to the chorus.

70ml is heaps to express at once at this stage. I happen to have very good supply of milk, even an oversupply. In the first couple of weeks I couldn't express more than 20ml at a time (now I can get 150ml or even more sometimes). I would not be doubting your supply at all.

By the way little things like whether she was weighed before or immediately after a wee or a poo will make quite a difference in how much she weighs at that moment, so she could well have put on more weight than the measurements suggest.

In the first few days, while we were in hospital, DD had a bit of jaundice. So we had to feed her 3-hourly to try to clear that from her system. Some things we did to wake her up enough to feed were:

- don't let her sleep for too long without waking for a feed

- feed one breast, then change the nappy to wake her up, then offer the other breast

- express a bit of milk so there's a drop on your nipple, and try to get this into her mouth so she gets the taste of it and remembers there is milk to be had if she sucks

- stroke her head to wake her up, stroke other parts of her

- gently wipe her head with a cool wet cloth to wake her up (yeah, it seems mean, but it worked for us - I called it "bugging the baby into feeding more").

- If you are using the normal, front hold, tuck her bum in closer to you to get her to suck again with more enthusiasm. No idea why this works, but it helped us. It was a suggestion of the breastfeeding advice midwife in the hospital.

I hope your worries about this are over soon.